Last week saw Dave Letterman shaking up the late-night landscape with the announcement of his imminent retirement, which as since led to all manner of speculation on a replacement, but the impact has already gone further down the pop culture rabbit hole. Watch 'The Simpsons' pay tribute to…

The Simpsons is now into it's 25th season on Fox, hard to believe that an animated show could last that long. The Simpsons started as a bit on The Tracy Ullman Show in 1987, created by Matt Groening based on his life. The show started its half hour prime time run in 1989 and has bee…